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Validate an IP address

Posted Date: 11 Mar 2004	Resource Type: Articles	Category: .NET Framework
Author: Satheesh Sugumaran	Member Level: Gold
Rating:	Points: 5

' Validate an IP address
' Example:
' MessageBox.Show(IsValidIP("123.14.0.255")) ' => True
' MessageBox.Show(IsValidIP("256.14.0.255")) ' => False


Function ChkValidIP(ByVal ipAddress As String) As Boolean
    Return System.Text.RegularExpressions.Regex.IsMatch(ipAddress, _
        "^(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}$")
End Function

Responses

Author: naveen 02 Sep 2004 Member Level: Bronze Points : 0

Hi ,
I was looking for the code to validate IP address. U r code is great. Hats off to u

Author: Manny Duarte 08 Sep 2004 Member Level: Bronze Points : 0

To get a valid IP, you should use the following expression. Reason being is that the last octect has to be less than 255.

^(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){2}(\.(25[0-4]|2[0-4]\d|[0-1]?\d?\d))$

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